Lots of frozen mountains, and ski resorts, so probably there would be obamasnow, sneasal, a articuno, and lots more ice types. If you go down the mountains, it turns into a nice forested area, with a big lake, and diverse terrain. Maybe being able to harbor all types of Pokemon due to almost everything being here. Sand mines, lots of ground and desert Pokemon. Some quarry's would have rock types. We would have ursaring, stantler, sawbuck, far fetched, and some fox, as hunting game in the forest. The lake nearby, is big enough to harbor lots of life, probably not ones from the ocean. In the summer, the fire types such as magmar bring heat waves. Fairys in the forest, dark, in urban, or forested areas. Steel, near the city, electric, at the power plant that would have a zapados and lots of poison types. Psychic types at the fair. And our fields and forests would be full bugs, rodents, and birds. So pretty much all Pokemon. Just the place to become the. Very best I guess.
As for gyms, grass, ice,water, ground or rock, dark, electric, poison, normal, fighting. Plus we would have an elite four I know it.